Safety yieldable gearing.



El Ml SAFETY YIELDABLB GEARING. APPLICATION :ILED JAN. 28

COBB.

Patented Sept. 20, 1910.

2 SHEETS-SHEET 1.

q/vi-Mwoaeo E. M. COBB. SAFETY YIELDABLE GBARING. APPLICATION IFILBI) JAN.2B,'1910.

m 9 q wm 0 2 .8 m 3 SW d2 6 t H m a P m 4 W a Ill M 6 1. Irl w E7 restricted to sue driven thereby in case of any sudden and unwith a series of .citizen of the United States, residing at 'ap ertains to make and use the same.

Eulle 1 revolves UNITED STATES PATENT OFFICE.

ELMEB M. COBB, OF SOUTH PORTLAND, MAINE, ASSIGNOR TO EDWARD M. LANG, J'B.,

or ron'rnam), MAINE.

SAFETY YIELDABLE GEABING.

Specification of Letters Patent.

Patented Sept. 20, 1910.

Original application filed November 24, 1909, Serial No. 529,829. Divided and this application filed January 28, 1910. Serial No. 540,676. 7

To all who rib it may concern: I

Be it known that 'I, ELMER M. Gone, a

South Portland, in the county of Cumberland and State of Maine, have invented certain new and useful Im rovements in Safety Yieldable Gearin an I do hereby declare the following t0%) a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it y invention relates to improvements in safety yieldable gearing.

The object of my invention is to provide means whereby a constantly running pulley may be disconnected from the mechanism due strain upon such drlven mechanism, thereby preventing injury to the machine or mechanism. 7

This invention is intended especially to be applied to machines for making solder hemmed caps, and is a division of my former a plication, filed November 24, 1909, Serial 0. 529,829. invention, however, is not machines, but may be applied to machines generally, and especially to those machines subject to sudden changes of load.

With the objects stated in view, my invention consists in the construction and combinations of parts as hereinafter described and claimed.

a In the accompanying drawingsfFigure 1 is a side view of a portion of a hemmed cap machine, showing my invention applied thereto. Fig. 2 is an enlarged detail view,

artly in section, showin the hub and reated parts of the safety c utch. Fig. 3 is a cross section thereof on the line 33 of Fig. 2. Fi 4 is a horizontal section of a part of the hub, and Fig. 5 is a side view, partly in section, of the clutch disks.

1 re resents the main driving pulley driven by a belt, not shown, from any suitable source of power. This pulley is provided with spokes 2 and an elongated hub 3, extending inwardly, as shown in Fig. 3.

4 represents the main shaft, on which the freely, exce t when it is eye to it, as hereinafter described. Bolted to the hub 3 is a rin 5, being secured thereto by bolts 6 and t is ring is rovided depressions in its ace, one 1 wheel may be used, if desired, and the c ar-' acter of the transmission gear from the main shaigt 4 to the machine may be varied as desire The hub 7 has fastened thereto, or made integral therewith, a disk 11, from which project at intervals tubes 12 which are internally screw threaded. Vlithin each of these tubes 12 is mounted a plunger or pawl 13, having a rather blunt ointed end, one side ofsaid pointed end being inclined considerably more than the other, as shown in Fig. 2, this plunger being adapted-toseat in the de ress1ons cut in the circumferential face 0 the ring 5. Each of these plungers is normally forced inward toward the shaft 4 by a spring 14, which is secured around the stem of t e plunger and presses against the head thereof and against a ca 15, which is adapted to screw into the tu 12, whereby the tension of the spring 14 may be adjusted, the stem 15 of the plunger passing freely throu h a perforation in said cap. The cap 15' is provided, with holes 16, with which a wrench may be engaged, and a lock nut 17 is provided, having perforations 18 for engagement with the wrench.

The construction of all the tubes 12, as shown in Fig. 2, is identical.

Adjacent to the disk 11, but not attached thereto, is the annular disk 19, L-shaped in cross section, as shown in Fig. 3, the inner part of which projxects between the ring 5 and the hub 3 of t e pulley. The ring 5 is also provided with a series of radial oles, in each of which is mounted a leather disk 20, a spring 21 and an ad'usting screw 22, by means of which the dis 19 is continued in its forward movement, by the movement of the pulley 1, thereby engaging with the plungers 13 mounted in the 11, preventing said plungers from again engaging with the ring 5 until pro erly positioned. l he hub 3 is also provi ed with a perforation through which passesa pin 23', having an adjusting head 24 screw-threadel thereon.

riphery A sprin 25 normally tends to press said pin outward y. The inner part of this pin is enlarged, as shown, at 26, passing through a perforation in the'ring- 5,and the 151 19 is also providedwith a perforation 27 ig 4. The ring 19 is also provided on its peto the depressions in the circumferentia face of the ring 5, and is also provided with raised portions 29, so that if, for any rea son, the plungers should be disengaged from the rin 5, the pulley 1 would be permitted to revo ve freely as these plungers ride on, the raised portions 29. Consequently,'-thei' 'plungers 13, as the pulley '1 revolves, will .not enter the depressions in the ring every little while, which action, if itv occurred,

' would produce a racking strain very injurious to the machine.

The ulley 1 is secured which is screwed onto the main shaft by means of a bolt 31, said cap hem of the same diameter as the hub of the u ey,and

'1'will continue to revolve and 32 represents a removable pin, w ich passes through the ca 30- and into theshaft 4:, to

reventthe bo t 31 from being unscrewed ,y the revolution of the ulley 1.

The operation 13 as f0 ows: If any-undue resistance should occur, such as, for example, that due to a wrench or other pieceof lron falling into the" gearing the pulley the plungers V 13 will be forced out of the notches in the ring-5, and will be carried along by friction until they ride on the raised portions 29 of. the ring 19, whereupon 'the pulley will re-' 'volve freely without driving any part/of the machine. After the obstruction is removed,

the parts may be easily adjustedv back into the original osition, by causin the. pulley 1 to be revo ved slightly relativel to the ring or sleeve 5, and the shaft 4, w ich can be done easily by turning the pulley backward and pressing'in the pin 26 against the tension of the spring 25 until, during the revolution, it enters the hole 27 in the disk '19, whereby the grooves in the ring 5 and the 'rin 19 are locked in proper alinement with eac other by the plungers 13;

I claim ii In a Imachine 'of the character described, the combination of driven mechanism, including'a'main shaft, and-safety devices, including a pulley'loosely mounted on said shaft and'provided' with notches on its pressed pawls mounted in saidcastin I adapted normally to engage the note esin hub, a casting secured to said shaft, spring with depressions 28 correspondingv disk in spondingto t e notches in the hub with poron the shaft 4 in the folibwing manner: 30 represents a cap 2. In a machine of the class'described, the v I combination of driven mechanism, includmg a mam shaft, and safety devices, lncluding a pulley loosely mounted on said shaft and provided with a notched hub, a "casting secured .to said shaft, spring-pressed pawls mounted in said casting and adapted normally to-engage the notches in said ub, and adisk secured-within said hub,'said rovided, with notches corretions of the same diameter as the diameter of the hub,fa nd with: other portions. of greater diameter, substantially as described. In a machineof the 4 haracter described,

the combination of di'i mechanism, in-

cluding a: mainf-shafg-andisafety devices, in-

cluding a pulley loosely-.Qmounted on said shaft and having a notched hub, a casting secured tosaid shaft and provided with projecting tubes, spring-pressed pawls in said tubes, adjusting-means, and a notched disk Secured within said hub, having portions: thereon of greater diameter than the diam-.

eter of said hub," substantiallyas described.

4. In a ma chine of the character described, the combination of driven mechanism, in cluding a main shaft, and safety devices, in-

cludin'g a pulley havin loosely mounted on said s aft, means for se curing said ulley on said shaft, a casting? a notched hub secured to said shaft and provided withpro. "f jecting tubes,*pawlsin said tubes, springs normally pressin means for adjust1n'gthe tension ,of said s rings, and 'a;notcheddisk secured within" t e hub, haying portions thereon greater in diameter thanjgthefliam'eter of the hub of said pulley, substantially as described.

5.;.Thevcomb iuation of a'shaft, a pulley said pawls inwardly---"' having a notched hub loosely mounted there.v

on, a casting. secured to said shaft, spring pressed pawls carried by said castin "and normally adaptedtoengage the note es in said hub, and a notched ring located between said casting and said hub, and having raised portions thereon of greater diameterthan the diameter of the hub of the pulley, substantially as described. Y

(i The combination of a, shaft, a pulley having a notched hub loosely mounted thereon, means for retaining said pulleyon said shaft,-a castlng secured to said shaft and provided with aseries of tubes, an adjustable 7 Spllng-piesSed awl in each of said tubes, and 'a notched isk between said casting and said hub, having portions of eater I diameter than the diameter of the n a machine of the character described,

the combination. ofdriven mechanism, in-

V ub of j the ulley, substantially as described. 1 7,? 12 5 eluding a main shaft, and safety devices, inv eluding a pulley loosely mounted on' -s'aid shaft and". a notched hub, adisk secured within said hub, said disk-beingprovided .130,

with notches corresponding to the notches in the hub, with portions of the same diameter as the diameter of the hub, and with other portions of greater diameter, and a casting secured to said shaft, spring-pressed pawls mounted therein, and adapted normally to engage the notches in said hub,

substantially as described.

8. In a machine of the character described, the combination of driven mechanism, including a main shaft, and safety devices, including a' pulley loosely mounted on said shaft and having a notched .hub, a notched disk secured within said hub, having portions thereon of greater diameter than the 1 diameter of the hub of the pulley, a casting secured to said shaft and provided with pro jecting tubes, spring-pressed pawls in said tubes, and adjusting means for said pawls, substantially as described.

ing portions thereon of greater diameter than the diameter of the hub of said pulley a casting secured to said shaft and provide with projecting tubes, awls in said tubw, sprin normally pressing said pawls inward y, and means for adjusting the tension of said springs, substantially as described.

In testimony whereof, I afiix my signature, in presence of two witnesses.

ELMER M. COBB. Witnesses:

K. M. TWIGG, ALDEN Srrnono. 

